<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="Cluster labels, billboards and points.">
    <meta name="cesium-sandcastle-labels" content="Tutorials,Showcases">
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../Build/CesiumUnminified/Cesium.js" nomodule></script>
    <script type="module" src="../load-cesium-es6.js"></script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
    #toolbar {
        background: rgba(42, 42, 42, 0.8);
        padding: 4px;
        border-radius: 4px;
    }
    #toolbar input {
        vertical-align: middle;
        padding-top: 2px;
        padding-bottom: 2px;
    }
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar">
    <table>
        <tbody><tr>
            <td>Pixel Range</td>
            <td>
                <input type="range" min="1" max="200" step="1" data-bind="value: pixelRange, valueUpdate: 'input'">
                <input type="text" size="2" data-bind="value: pixelRange">
            </td>
        </tr>
        <tr>
            <td>Minimum Cluster Size</td>
            <td>
                <input type="range" min="2" max="20" step="1" data-bind="value: minimumClusterSize, valueUpdate: 'input'">
                <input type="text" size="2" data-bind="value: minimumClusterSize">
            </td>
        </tr>
        </tbody>
    </table>
</div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
//Sandcastle_Begin
var viewer = new Cesium.Viewer('cesiumContainer');

var options = {
    camera : viewer.scene.camera,
    canvas : viewer.scene.canvas
};
var dataSourcePromise = viewer.dataSources.add(Cesium.KmlDataSource.load('../../SampleData/kml/facilities/facilities.kml', options));
dataSourcePromise.then(function(dataSource) {
    var pixelRange = 15;
    var minimumClusterSize = 3;
    var enabled = true;

    dataSource.clustering.enabled = enabled;
    dataSource.clustering.pixelRange = pixelRange;
    dataSource.clustering.minimumClusterSize = minimumClusterSize;

    var removeListener;

    var pinBuilder = new Cesium.PinBuilder();
    var pin50 = pinBuilder.fromText('50+', Cesium.Color.RED, 48).toDataURL();
    var pin40 = pinBuilder.fromText('40+', Cesium.Color.ORANGE, 48).toDataURL();
    var pin30 = pinBuilder.fromText('30+', Cesium.Color.YELLOW, 48).toDataURL();
    var pin20 = pinBuilder.fromText('20+', Cesium.Color.GREEN, 48).toDataURL();
    var pin10 = pinBuilder.fromText('10+', Cesium.Color.BLUE, 48).toDataURL();

    var singleDigitPins = new Array(8);
    for (var i = 0; i < singleDigitPins.length; ++i) {
        singleDigitPins[i] = pinBuilder.fromText('' + (i + 2), Cesium.Color.VIOLET, 48).toDataURL();
    }

    function customStyle() {
        if (Cesium.defined(removeListener)) {
            removeListener();
            removeListener = undefined;
        } else {
            removeListener = dataSource.clustering.clusterEvent.addEventListener(function(clusteredEntities, cluster) {
                cluster.label.show = false;
                cluster.billboard.show = true;
                cluster.billboard.id = cluster.label.id;
                cluster.billboard.verticalOrigin = Cesium.VerticalOrigin.BOTTOM;

                if (clusteredEntities.length >= 50) {
                    cluster.billboard.image = pin50;
                } else if (clusteredEntities.length >= 40) {
                    cluster.billboard.image = pin40;
                } else if (clusteredEntities.length >= 30) {
                    cluster.billboard.image = pin30;
                } else if (clusteredEntities.length >= 20) {
                    cluster.billboard.image = pin20;
                } else if (clusteredEntities.length >= 10) {
                    cluster.billboard.image = pin10;
                } else {
                    cluster.billboard.image = singleDigitPins[clusteredEntities.length - 2];
                }
            });
        }

        // force a re-cluster with the new styling
        var pixelRange = dataSource.clustering.pixelRange;
        dataSource.clustering.pixelRange = 0;
        dataSource.clustering.pixelRange = pixelRange;
    }

    // start with custom style
    customStyle();

    var viewModel = {
        pixelRange: pixelRange,
        minimumClusterSize: minimumClusterSize
    };
    Cesium.knockout.track(viewModel);

    var toolbar = document.getElementById('toolbar');
    Cesium.knockout.applyBindings(viewModel, toolbar);

    function subscribeParameter(name) {
        Cesium.knockout.getObservable(viewModel, name).subscribe(
            function(newValue) {
                dataSource.clustering[name] = newValue;
            }
        );
    }

    subscribeParameter('pixelRange');
    subscribeParameter('minimumClusterSize');

    Sandcastle.addToggleButton('Enabled', true, function(checked) {
        dataSource.clustering.enabled = checked;
    });

    Sandcastle.addToggleButton('Custom Styling', true, function(checked) {
      customStyle();
    });

    var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
    handler.setInputAction(function(movement) {
        var pickedLabel = viewer.scene.pick(movement.position);
        if (Cesium.defined(pickedLabel)) {
            var ids = pickedLabel.id;
            if (Cesium.isArray(ids)) {
                for (var i = 0; i < ids.length; ++i) {
                    ids[i].billboard.color = Cesium.Color.RED;
                }
            }
        }
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
});
//Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    window.startupCalled = true;
    startup(Cesium);
}
</script>
</body>
</html>
